Midfielder Jay Smith has completed a permanent move to Notts County following two months on loan at the League Two club.
Smith has not played for Southend for nearly a year following a spell at Roots Hall blighted by injury.
Also leaving the Shrimpers is winger Mitchell Cole. The midfielder is linking up with former Grays Athletic boss Mark Stimson at Stevenage Borough.
Cole, signed from Grays, has only made five appearances for Blues this campaign and has been unable to oust Mark Gower from the starting line-up.
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